[INFO] cloning repository https://github.com/Ks5810/bored
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Ks5810/bored" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKs5810%2Fbored", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKs5810%2Fbored'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3b21d14daac112e2a98ee17e2fa6b4d0679b242b
[INFO] checking Ks5810/bored against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKs5810%2Fbored" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Ks5810/bored
[INFO] finished tweaking git repo https://github.com/Ks5810/bored
[INFO] tweaked toml for git repo https://github.com/Ks5810/bored written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Ks5810/bored on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Ks5810/bored already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4047082c6c9efbaea8aa6d605c2360f135aa13450dfaa11580ccbed07185fe0d
[INFO] running `Command { std: "docker" "start" "-a" "4047082c6c9efbaea8aa6d605c2360f135aa13450dfaa11580ccbed07185fe0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4047082c6c9efbaea8aa6d605c2360f135aa13450dfaa11580ccbed07185fe0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4047082c6c9efbaea8aa6d605c2360f135aa13450dfaa11580ccbed07185fe0d", kill_on_drop: false }`
[INFO] [stdout] 4047082c6c9efbaea8aa6d605c2360f135aa13450dfaa11580ccbed07185fe0d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Dunmustuse_in_always_ok" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 566cb81b32efa3c84ea98c26795e46749b7a47da178132450ae3130c0ff65f6c
[INFO] running `Command { std: "docker" "start" "-a" "566cb81b32efa3c84ea98c26795e46749b7a47da178132450ae3130c0ff65f6c", kill_on_drop: false }`
[INFO] [stderr]     Checking indexmap v0.4.1
[INFO] [stderr]     Checking priority-queue v0.6.0
[INFO] [stderr]     Checking graph_practice v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `size` is never read
[INFO] [stdout]   --> src/disjoint_set.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct DisjointSet {
[INFO] [stdout]    |            ----------- field in this struct
[INFO] [stdout] 11 |     set: Vec<isize>,
[INFO] [stdout] 12 |     size: usize
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `DisjointSet` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<isize, Infallible>
[INFO] [stdout]   --> src/disjoint_set.rs:41:16
[INFO] [stdout]    |
[INFO] [stdout] 41 |         return isize::try_from(temp).unwrap();
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `graph_practice` (lib) due to 1 previous error; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: field `size` is never read
[INFO] [stdout]   --> src/disjoint_set.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct DisjointSet {
[INFO] [stdout]    |            ----------- field in this struct
[INFO] [stdout] 11 |     set: Vec<isize>,
[INFO] [stdout] 12 |     size: usize
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `DisjointSet` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<isize, Infallible>
[INFO] [stdout]   --> src/disjoint_set.rs:41:16
[INFO] [stdout]    |
[INFO] [stdout] 41 |         return isize::try_from(temp).unwrap();
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `graph_practice` (lib test) due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "566cb81b32efa3c84ea98c26795e46749b7a47da178132450ae3130c0ff65f6c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "566cb81b32efa3c84ea98c26795e46749b7a47da178132450ae3130c0ff65f6c", kill_on_drop: false }`
[INFO] [stdout] 566cb81b32efa3c84ea98c26795e46749b7a47da178132450ae3130c0ff65f6c